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Install the net-snmp software.

cd /usr/ports/net-mgmt/net-snmp
make install

Add firewall rules to prevent anyone other than you from communicating with your snmp daemon. If you're running mrtg at 1.2.3.4:

ipfw add 11 deny udp from me snmp to not 1.2.3.4
ipfw add 11 deny udp from not 1.2.3.4 to me snmp
ipfw add 11 deny udp from any to me smux

Create a configuration file in /usr/local/etc/snmpd.conf.

rocommunity public

Enable snmpd in /etc/rc.conf.

snmpd_enable="YES"
snmpd_conffile="/usr/local/etc/snmpd.conf"

Start snmpd.

/usr/local/etc/rc.d/snmpd.sh start

Make sure it's running.

tail /var/log/snmpd.log

netstat -an|grep '*.161'